mirror of
https://github.com/k3s-io/kubernetes.git
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112 lines
4.1 KiB
Go
112 lines
4.1 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package util
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import (
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"fmt"
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v1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/kubernetes/pkg/util/filesystem"
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)
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// FromApiserverCache modifies <opts> so that the GET request will
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// be served from apiserver cache instead of from etcd.
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func FromApiserverCache(opts *metav1.GetOptions) {
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opts.ResourceVersion = "0"
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}
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var IsUnixDomainSocket = filesystem.IsUnixDomainSocket
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// GetNodenameForKernel gets hostname value to set in the hostname field (the nodename field of struct utsname) of the pod.
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func GetNodenameForKernel(hostname string, hostDomainName string, setHostnameAsFQDN *bool) (string, error) {
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kernelHostname := hostname
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// FQDN has to be 64 chars to fit in the Linux nodename kernel field (specification 64 chars and the null terminating char).
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const fqdnMaxLen = 64
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if len(hostDomainName) > 0 && setHostnameAsFQDN != nil && *setHostnameAsFQDN {
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fqdn := fmt.Sprintf("%s.%s", hostname, hostDomainName)
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// FQDN has to be shorter than hostnameMaxLen characters.
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if len(fqdn) > fqdnMaxLen {
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return "", fmt.Errorf("failed to construct FQDN from pod hostname and cluster domain, FQDN %s is too long (%d characters is the max, %d characters requested)", fqdn, fqdnMaxLen, len(fqdn))
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}
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kernelHostname = fqdn
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}
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return kernelHostname, nil
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}
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// GetContainerByIndex validates and extracts the container at index "idx" from
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// "containers" with respect to "statuses".
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// It returns true if the container is valid, else returns false.
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func GetContainerByIndex(containers []v1.Container, statuses []v1.ContainerStatus, idx int) (v1.Container, bool) {
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if idx < 0 || idx >= len(containers) || idx >= len(statuses) {
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return v1.Container{}, false
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}
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if statuses[idx].Name != containers[idx].Name {
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return v1.Container{}, false
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}
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return containers[idx], true
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}
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type ResourceOpts struct {
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PodResources *v1.ResourceRequirements
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ContainerResources *v1.ResourceRequirements
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}
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// GetLimits calculates the resource limits for the container.
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// It uses the container's explicit limits first. If limits for CPU or Memory
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// are not explicitly set at the container level (i.e., they are zero),
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// the corresponding limits from the Pod's resource requirements are applied
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// as defaults to the returned map.
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// TODO(ndixita): Consolidate resource limit logic
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// The implementation of CPU/Memory limit calculation is duplicated here and in
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// pkg/kubelet/kuberuntime/kuberuntime_container_linux.go (getCPULimits/getMemoryLimits).
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// Refactor into a shared utility function.
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func GetLimits(res *ResourceOpts) v1.ResourceList {
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if res == nil {
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return v1.ResourceList{}
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}
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limitsOrEmpty := func(containerResources *v1.ResourceRequirements) v1.ResourceList {
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if containerResources == nil || containerResources.Limits == nil {
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return v1.ResourceList{}
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}
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return containerResources.Limits
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}
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containerLimits := limitsOrEmpty(res.ContainerResources)
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if res.PodResources == nil || len(res.PodResources.Limits) == 0 {
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// if pod-level limits are not set, return container-level limits
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return containerLimits
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}
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podLevelLimits := res.PodResources.Limits
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// When container-level CPU limit is not set, the pod-level
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// limit CPU is applied at container-level
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if containerLimits.Cpu().IsZero() && !podLevelLimits.Cpu().IsZero() {
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containerLimits[v1.ResourceCPU] = podLevelLimits[v1.ResourceCPU]
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}
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// When container-level Memory limit is not set, the pod-level
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// limit Memory is applied at container-level
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if containerLimits.Memory().IsZero() && !podLevelLimits.Memory().IsZero() {
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containerLimits[v1.ResourceMemory] = podLevelLimits[v1.ResourceMemory]
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}
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return containerLimits
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}
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